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1. The teacher asked, "Who can solve this problem?"
A. The teacher asked who could solve this problem.
B. The teacher asked who can solve that problem.
C. The teacher asked who could solve that problem.
D. The teacher asked who can solve this problem.
2. If you want to learn a musical instrument, you need to practice everyday.
A. You are unable to learn a mus ical instrument on the condition that you practice everyday.
B. You can learn a musical instru ment without practicing everyda y.
C. Provided that you learn a mus ical instrument, you can practice everyday.
D. You can't learn a musical instr ument unless you practice every day.
3. It took me almost a week to solve that challenging puzzle.
A. Almost a week was taken for me to solve that challenging puz zle.
B. I spent almost a week to solve that challenging puzzle.
C. Solving that challenging puzzl e cost me almost a week.
D. I spent almost a week solving that challenging puzzle.